Tina Brown’s new book, “The Vanity Fair Diaries,” hits next month just as the golden era of magazine publishing is getting renewed attention with the passing of S.I. Newhouse Jr. on Sunday.

Brown, whose Princess Diana book “The Diana Chronicles” sold more than 500,000 copies for Doubleday in 2007, has taken the latest book to Henry Holt, where Stephen Rubin, her former editor at Doubleday, is now the president and publisher.

Sources estimate she snagged close to a seven figure advance and Henry Holt, not usually known as the biggest spender, is believed to be cranking out a 100,000 copy first printing.

Rubin would not disclose terms or first printings, but did say, “It’s inside an industry people love reading about — witness ‘The Devil Wears Prada,’ which I also published — by a visionary editor with the best pair of eyes in the business.”

Brown ran Vanity Fair from 1983 to 1992. In the early days, the magazine struggled mightily, and she had to plead with S.I.Newhouse to give her a few more issues and not pull the plug. She got a blockbuster Harry Benson cover photo of Ronald Reagan dancing with Nancy. Newhouse relented, the cover appeared, and the magazine turned the corner.

Brown told Media Ink she was searching for a book idea and had kept “voluminous diaries” throughout the ’80s.

“When I came to write about the period, I found 300,000 words not looked at since then and realized what a fascinating picture it was of a vanished golden era of magazines.

“I shaped, edited and amplified the material into a real-time surf through the ’80s madness and the court of Condé Nast.”

She was succeeded by Graydon Carter in 1992 when she was the surprise choice to lead The New Yorker.

Carter struggled out of the gate, but then hit on the New Establishment cover of media and tech moguls in 1994, which became a hearty annual, and the magazine soon regained its momentum. Carter became a celebrity editor and one of the longest serving in Condé Nast history.

Speculation is swirling that Carter himself may do a memoir. Reached at the Vanity Fair New Establishment conference in Los Angeles, Carter did not dispel the notion.

“It’s certainly a possibility,” he told Media Ink, “but I’ve got four more issues of Vanity Fair to close before I begin to plot the next chapter.”